Added preview images

README.md

@@ -1,5 +1,7 @@
 # MqTrigger
 
+![mqtrigger pinout](doc/img/mqtrigger-preview.png)
+
 1. [Overview](#overview)   
  	1.1. [Components](#components)  
  	1.2. [Features](#features)
@@ -17,7 +19,7 @@
 
 
 ## Overview
-MqTrigger is a simple, multi-channel switch controller with MQTT and HTTP APIs. The project arose from the need to drive separate boards of encoded remote controllers (433 an 868MHz gate, garage, alarm system remotes) as well as general 230V relays.
+MqTrigger is a simple, multi-channel switch controller with MQTT(S) and HTTP API. The project arose from the need to drive separate boards of encoded remote controllers (433 an 868MHz gate, garage, alarm system remotes) as well as general-purpose 230V relays.
 
 ### Components
 - software